Power Vented Indoor Gas Duct Furnace - Periodic Maintenance

Should maintenance be required, perform the following inspection and service routine:

• Inspect the area near the unit to be sure that there is no combustible material located within the minimum clearance requirements listed in this manual (see “Installation: Mechanical,” p. 11 and Table 3, p. 12).

• Turn off the manual gas valve and electrical power to the gas duct furnace.

• To clean or replace the main burners, remove the bottom panel and compress the spring by moving the burner toward the manifold. Slide the opposite end of the burner downward from the locating slot while retaining spring is still compressed. Pull the burners away from the manifold.

• With the burners removed, wire brush the inside surfaces of the heat exchanger.

• Remove any dirt, dust, or other foreign matter from the burners using a wire brush and/or compressed air. Ensure that all parts are unobstructed. Inspect and clean pilot burner if necessary.

• Reassemble the gas duct furnace by replacing all parts in reverse order.

• Complete the appropriate unit start-up procedure as given in “Operation,” p. 28 (see lighting instruction plate on the access side of the unit).

• Check the burner adjustment (see “Primary Air Shutter Adjustment,” p. 31).

• Check all gas control valves and pipe connections for leaks.

• Check the operation of the automatic gas valve by lowering the setting of the thermostat, stopping the operation of the gas duct furnace. The gas valve should close tightly, completely extinguishing the flame on the main burners.

• Check the operation of the pilot safety device by closing the pilot line valve, extinguishing the pilot flame. Within one minute the automatic gas valve should close, extinguishing the flame on the main burners.

• Inspect and service the blower section of the system.

• Check and test the operational functions of all safety devices supplied with your unit.